sound/usb/pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/bitrev.h>
   8 #include <linux/ratelimit.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "usbaudio.h"
  18 #include "card.h"
  19 #include "quirks.h"
  20 #include "debug.h"
  21 #include "endpoint.h"
  22 #include "helper.h"
  23 #include "pcm.h"
  24 #include "clock.h"
  25 #include "power.h"
  26 #include "media.h"
  27
  28 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31 /* return the estimated delay based on USB frame counters */
  32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                     unsigned int rate)
  34 {
  35         int current_frame_number;
  36         int frame_diff;
  37         int est_delay;
  38
  39         if (!subs->last_delay)
  40                 return 0; /* short path */
  41
  42         current_frame_number = usb_get_current_frame_number(subs->dev);
  43         /*
  44          * HCD implementations use different widths, use lower 8 bits.
  45          * The delay will be managed up to 256ms, which is more than
  46          * enough
  47          */
  48         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50         /* Approximation based on number of samples per USB frame (ms),
  51            some truncation for 44.1 but the estimate is good enough */
  52         est_delay =  frame_diff * rate / 1000;
  53         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                 est_delay = subs->last_delay - est_delay;
  55         else
  56                 est_delay = subs->last_delay + est_delay;
  57
  58         if (est_delay < 0)
  59                 est_delay = 0;
  60         return est_delay;
  61 }
  62
  63 /*
  64  * return the current pcm pointer.  just based on the hwptr_done value.
  65  */
  66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_usb_substream *subs = substream->runtime->private_data;
  69         unsigned int hwptr_done;
  70
  71         if (atomic_read(&subs->stream->chip->shutdown))
  72                 return SNDRV_PCM_POS_XRUN;
  73         spin_lock(&subs->lock);
  74         hwptr_done = subs->hwptr_done;
  75         substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                 substream->runtime->rate);
  77         spin_unlock(&subs->lock);
  78         return hwptr_done / (substream->runtime->frame_bits >> 3);
  79 }
  80
  81 /*
  82  * find a matching audio format
  83  */
  84 static struct audioformat *find_format(struct snd_usb_substream *subs)
  85 {
  86         struct audioformat *fp;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each_entry(fp, &subs->fmt_list, list) {
  91                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                         continue;
  93                 if (fp->channels != subs->channels)
  94                         continue;
  95                 if (subs->cur_rate < fp->rate_min ||
  96                     subs->cur_rate > fp->rate_max)
  97                         continue;
  98                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                         unsigned int i;
 100                         for (i = 0; i < fp->nr_rates; i++)
 101                                 if (fp->rate_table[i] == subs->cur_rate)
 102                                         break;
 103                         if (i >= fp->nr_rates)
 104                                 continue;
 105                 }
 106                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                 if (! found) {
 108                         found = fp;
 109                         cur_attr = attr;
 110                         continue;
 111                 }
 112                 /* avoid async out and adaptive in if the other method
 113                  * supports the same format.
 114                  * this is a workaround for the case like
 115                  * M-audio audiophile USB.
 116                  */
 117                 if (attr != cur_attr) {
 118                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                 continue;
 123                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                 found = fp;
 128                                 cur_attr = attr;
 129                                 continue;
 130                         }
 131                 }
 132                 /* find the format with the largest max. packet size */
 133                 if (fp->maxpacksize > found->maxpacksize) {
 134                         found = fp;
 135                         cur_attr = attr;
 136                 }
 137         }
 138         return found;
 139 }
 140
 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                          struct usb_host_interface *alts,
 143                          struct audioformat *fmt)
 144 {
 145         struct usb_device *dev = chip->dev;
 146         unsigned int ep;
 147         unsigned char data[1];
 148         int err;
 149
 150         if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                 return -EINVAL;
 152         ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154         data[0] = 1;
 155         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                               data, sizeof(data));
 159         if (err < 0) {
 160                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                               iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         int err;
 175
 176         data[0] = 1;
 177         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                               UAC2_EP_CS_PITCH << 8, 0,
 180                               data, sizeof(data));
 181         if (err < 0) {
 182                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                               iface, fmt->altsetting);
 184                 return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * initialize the pitch control and sample rate
 192  */
 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                        struct usb_host_interface *alts,
 195                        struct audioformat *fmt)
 196 {
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (fmt->protocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 static int start_endpoints(struct snd_usb_substream *subs)
 212 {
 213         int err;
 214
 215         if (!subs->data_endpoint)
 216                 return -EINVAL;
 217
 218         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                 ep->data_subs = subs;
 224                 err = snd_usb_endpoint_start(ep);
 225                 if (err < 0) {
 226                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                         return err;
 228                 }
 229         }
 230
 231         if (subs->sync_endpoint &&
 232             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                         err = usb_set_interface(subs->dev,
 238                                                 subs->sync_endpoint->iface,
 239                                                 subs->sync_endpoint->altsetting);
 240                         if (err < 0) {
 241                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                 dev_err(&subs->dev->dev,
 243                                            "%d:%d: cannot set interface (%d)\n",
 244                                            subs->sync_endpoint->iface,
 245                                            subs->sync_endpoint->altsetting, err);
 246                                 return -EIO;
 247                         }
 248                 }
 249
 250                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                 ep->sync_slave = subs->data_endpoint;
 253                 err = snd_usb_endpoint_start(ep);
 254                 if (err < 0) {
 255                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                         return err;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 264 {
 265         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 266                 snd_usb_endpoint_stop(subs->sync_endpoint);
 267
 268         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 269                 snd_usb_endpoint_stop(subs->data_endpoint);
 270
 271         if (wait) {
 272                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 273                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 274         }
 275 }
 276
 277 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 278                                      unsigned int altsetting,
 279                                      struct usb_host_interface **alts,
 280                                      unsigned int *ep)
 281 {
 282         struct usb_interface *iface;
 283         struct usb_interface_descriptor *altsd;
 284         struct usb_endpoint_descriptor *epd;
 285
 286         iface = usb_ifnum_to_if(dev, ifnum);
 287         if (!iface || iface->num_altsetting < altsetting + 1)
 288                 return -ENOENT;
 289         *alts = &iface->altsetting[altsetting];
 290         altsd = get_iface_desc(*alts);
 291         if (altsd->bAlternateSetting != altsetting ||
 292             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 293             (altsd->bInterfaceSubClass != 2 &&
 294              altsd->bInterfaceProtocol != 2   ) ||
 295             altsd->bNumEndpoints < 1)
 296                 return -ENOENT;
 297         epd = get_endpoint(*alts, 0);
 298         if (!usb_endpoint_is_isoc_in(epd) ||
 299             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 300                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 301                 return -ENOENT;
 302         *ep = epd->bEndpointAddress;
 303         return 0;
 304 }
 305
 306 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 307  * applies. Returns 1 if a quirk was found.
 308  */
 309 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 310                                          struct usb_device *dev,
 311                                          struct usb_interface_descriptor *altsd,
 312                                          unsigned int attr)
 313 {
 314         struct usb_host_interface *alts;
 315         struct usb_interface *iface;
 316         unsigned int ep;
 317         unsigned int ifnum;
 318
 319         /* Implicit feedback sync EPs consumers are always playback EPs */
 320         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 321                 return 0;
 322
 323         switch (subs->stream->chip->usb_id) {
 324         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 325         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 326                 ep = 0x81;
 327                 ifnum = 3;
 328                 goto add_sync_ep_from_ifnum;
 329         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 330         case USB_ID(0x0763, 0x2081):
 331                 ep = 0x81;
 332                 ifnum = 2;
 333                 goto add_sync_ep_from_ifnum;
 334         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 335                 ep = 0x86;
 336                 ifnum = 2;
 337                 goto add_sync_ep_from_ifnum;
 338         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 339                 ep = 0x81;
 340                 ifnum = 2;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 343         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 344                 ep = 0x81;
 345                 ifnum = 1;
 346                 goto add_sync_ep_from_ifnum;
 347         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 348                 ep = 0x84;
 349                 ifnum = 0;
 350                 goto add_sync_ep_from_ifnum;
 351         }
 352
 353         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 354             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 355             altsd->bInterfaceProtocol == 2 &&
 356             altsd->bNumEndpoints == 1 &&
 357             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 358             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 359                                       altsd->bAlternateSetting,
 360                                       &alts, &ep) >= 0) {
 361                 goto add_sync_ep;
 362         }
 363
 364         /* No quirk */
 365         return 0;
 366
 367 add_sync_ep_from_ifnum:
 368         iface = usb_ifnum_to_if(dev, ifnum);
 369
 370         if (!iface || iface->num_altsetting == 0)
 371                 return -EINVAL;
 372
 373         alts = &iface->altsetting[1];
 374
 375 add_sync_ep:
 376         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 377                                                    alts, ep, !subs->direction,
 378                                                    SND_USB_ENDPOINT_TYPE_DATA);
 379         if (!subs->sync_endpoint)
 380                 return -EINVAL;
 381
 382         subs->data_endpoint->sync_master = subs->sync_endpoint;
 383
 384         return 1;
 385 }
 386
 387 static int set_sync_endpoint(struct snd_usb_substream *subs,
 388                              struct audioformat *fmt,
 389                              struct usb_device *dev,
 390                              struct usb_host_interface *alts,
 391                              struct usb_interface_descriptor *altsd)
 392 {
 393         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 394         unsigned int ep, attr;
 395         bool implicit_fb;
 396         int err;
 397
 398         /* we need a sync pipe in async OUT or adaptive IN mode */
 399         /* check the number of EP, since some devices have broken
 400          * descriptors which fool us.  if it has only one EP,
 401          * assume it as adaptive-out or sync-in.
 402          */
 403         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 404
 405         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 406                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 407
 408                 /*
 409                  * In these modes the notion of sync_endpoint is irrelevant.
 410                  * Reset pointers to avoid using stale data from previously
 411                  * used settings, e.g. when configuration and endpoints were
 412                  * changed
 413                  */
 414
 415                 subs->sync_endpoint = NULL;
 416                 subs->data_endpoint->sync_master = NULL;
 417         }
 418
 419         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 420         if (err < 0)
 421                 return err;
 422
 423         /* endpoint set by quirk */
 424         if (err > 0)
 425                 return 0;
 426
 427         if (altsd->bNumEndpoints < 2)
 428                 return 0;
 429
 430         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 431                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 432             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 433                 return 0;
 434
 435         /*
 436          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 437          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 438          * error fall back to SYNC mode and don't create sync endpoint
 439          */
 440
 441         /* check sync-pipe endpoint */
 442         /* ... and check descriptor size before accessing bSynchAddress
 443            because there is a version of the SB Audigy 2 NX firmware lacking
 444            the audio fields in the endpoint descriptors */
 445         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 446             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 447              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 448                 dev_err(&dev->dev,
 449                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 450                            fmt->iface, fmt->altsetting,
 451                            get_endpoint(alts, 1)->bmAttributes,
 452                            get_endpoint(alts, 1)->bLength,
 453                            get_endpoint(alts, 1)->bSynchAddress);
 454                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 455                         return 0;
 456                 return -EINVAL;
 457         }
 458         ep = get_endpoint(alts, 1)->bEndpointAddress;
 459         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 460             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 461              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 462                 dev_err(&dev->dev,
 463                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 464                            fmt->iface, fmt->altsetting,
 465                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 466                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 467                         return 0;
 468                 return -EINVAL;
 469         }
 470
 471         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 472                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 473
 474         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 475                                                    alts, ep, !subs->direction,
 476                                                    implicit_fb ?
 477                                                         SND_USB_ENDPOINT_TYPE_DATA :
 478                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 479         if (!subs->sync_endpoint) {
 480                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 481                         return 0;
 482                 return -EINVAL;
 483         }
 484
 485         subs->data_endpoint->sync_master = subs->sync_endpoint;
 486
 487         return 0;
 488 }
 489
 490 /*
 491  * find a matching format and set up the interface
 492  */
 493 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 494 {
 495         struct usb_device *dev = subs->dev;
 496         struct usb_host_interface *alts;
 497         struct usb_interface_descriptor *altsd;
 498         struct usb_interface *iface;
 499         int err;
 500
 501         iface = usb_ifnum_to_if(dev, fmt->iface);
 502         if (WARN_ON(!iface))
 503                 return -EINVAL;
 504         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 505         altsd = get_iface_desc(alts);
 506         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 507                 return -EINVAL;
 508
 509         if (fmt == subs->cur_audiofmt)
 510                 return 0;
 511
 512         /* close the old interface */
 513         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 514                 if (!subs->stream->chip->keep_iface) {
 515                         err = usb_set_interface(subs->dev, subs->interface, 0);
 516                         if (err < 0) {
 517                                 dev_err(&dev->dev,
 518                                         "%d:%d: return to setting 0 failed (%d)\n",
 519                                         fmt->iface, fmt->altsetting, err);
 520                                 return -EIO;
 521                         }
 522                 }
 523                 subs->interface = -1;
 524                 subs->altset_idx = 0;
 525         }
 526
 527         /* set interface */
 528         if (iface->cur_altsetting != alts) {
 529                 err = snd_usb_select_mode_quirk(subs, fmt);
 530                 if (err < 0)
 531                         return -EIO;
 532
 533                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 534                 if (err < 0) {
 535                         dev_err(&dev->dev,
 536                                 "%d:%d: usb_set_interface failed (%d)\n",
 537                                 fmt->iface, fmt->altsetting, err);
 538                         return -EIO;
 539                 }
 540                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 541                         fmt->iface, fmt->altsetting);
 542                 snd_usb_set_interface_quirk(dev);
 543         }
 544
 545         subs->interface = fmt->iface;
 546         subs->altset_idx = fmt->altset_idx;
 547         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 548                                                    alts, fmt->endpoint, subs->direction,
 549                                                    SND_USB_ENDPOINT_TYPE_DATA);
 550
 551         if (!subs->data_endpoint)
 552                 return -EINVAL;
 553
 554         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 555         if (err < 0)
 556                 return err;
 557
 558         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 559         if (err < 0)
 560                 return err;
 561
 562         subs->cur_audiofmt = fmt;
 563
 564         snd_usb_set_format_quirk(subs, fmt);
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Return the score of matching two audioformats.
 571  * Veto the audioformat if:
 572  * - It has no channels for some reason.
 573  * - Requested PCM format is not supported.
 574  * - Requested sample rate is not supported.
 575  */
 576 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 577                                        struct audioformat *fp,
 578                                        struct audioformat *match, int rate,
 579                                        snd_pcm_format_t pcm_format)
 580 {
 581         int i;
 582         int score = 0;
 583
 584         if (fp->channels < 1) {
 585                 dev_dbg(&subs->dev->dev,
 586                         "%s: (fmt @%p) no channels\n", __func__, fp);
 587                 return 0;
 588         }
 589
 590         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 591                 dev_dbg(&subs->dev->dev,
 592                         "%s: (fmt @%p) no match for format %d\n", __func__,
 593                         fp, pcm_format);
 594                 return 0;
 595         }
 596
 597         for (i = 0; i < fp->nr_rates; i++) {
 598                 if (fp->rate_table[i] == rate) {
 599                         score++;
 600                         break;
 601                 }
 602         }
 603         if (!score) {
 604                 dev_dbg(&subs->dev->dev,
 605                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 606                         fp, rate);
 607                 return 0;
 608         }
 609
 610         if (fp->channels == match->channels)
 611                 score++;
 612
 613         dev_dbg(&subs->dev->dev,
 614                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 615
 616         return score;
 617 }
 618
 619 /*
 620  * Configure the sync ep using the rate and pcm format of the data ep.
 621  */
 622 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 623 {
 624         int ret;
 625         struct audioformat *fp;
 626         struct audioformat *sync_fp = NULL;
 627         int cur_score = 0;
 628         int sync_period_bytes = subs->period_bytes;
 629         struct snd_usb_substream *sync_subs =
 630                 &subs->stream->substream[subs->direction ^ 1];
 631
 632         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 633             !subs->stream)
 634                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 635                                                    subs->pcm_format,
 636                                                    subs->channels,
 637                                                    subs->period_bytes,
 638                                                    0, 0,
 639                                                    subs->cur_rate,
 640                                                    subs->cur_audiofmt,
 641                                                    NULL);
 642
 643         /* Try to find the best matching audioformat. */
 644         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 645                 int score = match_endpoint_audioformats(subs,
 646                                                         fp, subs->cur_audiofmt,
 647                         subs->cur_rate, subs->pcm_format);
 648
 649                 if (score > cur_score) {
 650                         sync_fp = fp;
 651                         cur_score = score;
 652                 }
 653         }
 654
 655         if (unlikely(sync_fp == NULL)) {
 656                 dev_err(&subs->dev->dev,
 657                         "%s: no valid audioformat for sync ep %x found\n",
 658                         __func__, sync_subs->ep_num);
 659                 return -EINVAL;
 660         }
 661
 662         /*
 663          * Recalculate the period bytes if channel number differ between
 664          * data and sync ep audioformat.
 665          */
 666         if (sync_fp->channels != subs->channels) {
 667                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 668                         sync_fp->channels;
 669                 dev_dbg(&subs->dev->dev,
 670                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 671                         __func__, subs->period_bytes, sync_period_bytes);
 672         }
 673
 674         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 675                                           subs->pcm_format,
 676                                           sync_fp->channels,
 677                                           sync_period_bytes,
 678                                           0, 0,
 679                                           subs->cur_rate,
 680                                           sync_fp,
 681                                           NULL);
 682
 683         return ret;
 684 }
 685
 686 /*
 687  * configure endpoint params
 688  *
 689  * called  during initial setup and upon resume
 690  */
 691 static int configure_endpoint(struct snd_usb_substream *subs)
 692 {
 693         int ret;
 694
 695         /* format changed */
 696         stop_endpoints(subs, true);
 697         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 698                                           subs->pcm_format,
 699                                           subs->channels,
 700                                           subs->period_bytes,
 701                                           subs->period_frames,
 702                                           subs->buffer_periods,
 703                                           subs->cur_rate,
 704                                           subs->cur_audiofmt,
 705                                           subs->sync_endpoint);
 706         if (ret < 0)
 707                 return ret;
 708
 709         if (subs->sync_endpoint)
 710                 ret = configure_sync_endpoint(subs);
 711
 712         return ret;
 713 }
 714
 715 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 716 {
 717         int ret;
 718
 719         if (!subs->str_pd)
 720                 return 0;
 721
 722         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 723         if (ret < 0) {
 724                 dev_err(&subs->dev->dev,
 725                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 726                         subs->str_pd->pd_id, state, ret);
 727                 return ret;
 728         }
 729
 730         return 0;
 731 }
 732
 733 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 734 {
 735         int ret;
 736
 737         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 738         if (ret < 0)
 739                 return ret;
 740
 741         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 742         if (ret < 0)
 743                 return ret;
 744
 745         return 0;
 746 }
 747
 748 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 749 {
 750         int ret;
 751
 752         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 753         if (ret < 0)
 754                 return ret;
 755
 756         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 757         if (ret < 0)
 758                 return ret;
 759
 760         return 0;
 761 }
 762
 763 /*
 764  * hw_params callback
 765  *
 766  * allocate a buffer and set the given audio format.
 767  *
 768  * so far we use a physically linear buffer although packetize transfer
 769  * doesn't need a continuous area.
 770  * if sg buffer is supported on the later version of alsa, we'll follow
 771  * that.
 772  */
 773 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 774                              struct snd_pcm_hw_params *hw_params)
 775 {
 776         struct snd_usb_substream *subs = substream->runtime->private_data;
 777         struct audioformat *fmt;
 778         int ret;
 779
 780         ret = snd_media_start_pipeline(subs);
 781         if (ret)
 782                 return ret;
 783
 784         if (snd_usb_use_vmalloc)
 785                 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 786                                                        params_buffer_bytes(hw_params));
 787         else
 788                 ret = snd_pcm_lib_malloc_pages(substream,
 789                                                params_buffer_bytes(hw_params));
 790         if (ret < 0)
 791                 goto stop_pipeline;
 792
 793         subs->pcm_format = params_format(hw_params);
 794         subs->period_bytes = params_period_bytes(hw_params);
 795         subs->period_frames = params_period_size(hw_params);
 796         subs->buffer_periods = params_periods(hw_params);
 797         subs->channels = params_channels(hw_params);
 798         subs->cur_rate = params_rate(hw_params);
 799
 800         fmt = find_format(subs);
 801         if (!fmt) {
 802                 dev_dbg(&subs->dev->dev,
 803                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 804                            subs->pcm_format, subs->cur_rate, subs->channels);
 805                 ret = -EINVAL;
 806                 goto stop_pipeline;
 807         }
 808
 809         ret = snd_usb_lock_shutdown(subs->stream->chip);
 810         if (ret < 0)
 811                 goto stop_pipeline;
 812
 813         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 814         if (ret < 0)
 815                 goto unlock;
 816
 817         ret = set_format(subs, fmt);
 818         if (ret < 0)
 819                 goto unlock;
 820
 821         subs->interface = fmt->iface;
 822         subs->altset_idx = fmt->altset_idx;
 823         subs->need_setup_ep = true;
 824
 825  unlock:
 826         snd_usb_unlock_shutdown(subs->stream->chip);
 827         if (ret < 0)
 828                 goto stop_pipeline;
 829         return ret;
 830
 831  stop_pipeline:
 832         snd_media_stop_pipeline(subs);
 833         return ret;
 834 }
 835
 836 /*
 837  * hw_free callback
 838  *
 839  * reset the audio format and release the buffer
 840  */
 841 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 842 {
 843         struct snd_usb_substream *subs = substream->runtime->private_data;
 844
 845         snd_media_stop_pipeline(subs);
 846         subs->cur_audiofmt = NULL;
 847         subs->cur_rate = 0;
 848         subs->period_bytes = 0;
 849         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 850                 stop_endpoints(subs, true);
 851                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 852                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 853                 snd_usb_unlock_shutdown(subs->stream->chip);
 854         }
 855
 856         if (snd_usb_use_vmalloc)
 857                 return snd_pcm_lib_free_vmalloc_buffer(substream);
 858         else
 859                 return snd_pcm_lib_free_pages(substream);
 860 }
 861
 862 /*
 863  * prepare callback
 864  *
 865  * only a few subtle things...
 866  */
 867 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 868 {
 869         struct snd_pcm_runtime *runtime = substream->runtime;
 870         struct snd_usb_substream *subs = runtime->private_data;
 871         struct usb_host_interface *alts;
 872         struct usb_interface *iface;
 873         int ret;
 874
 875         if (! subs->cur_audiofmt) {
 876                 dev_err(&subs->dev->dev, "no format is specified!\n");
 877                 return -ENXIO;
 878         }
 879
 880         ret = snd_usb_lock_shutdown(subs->stream->chip);
 881         if (ret < 0)
 882                 return ret;
 883         if (snd_BUG_ON(!subs->data_endpoint)) {
 884                 ret = -EIO;
 885                 goto unlock;
 886         }
 887
 888         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 889         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 890
 891         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 892         if (ret < 0)
 893                 goto unlock;
 894
 895         ret = set_format(subs, subs->cur_audiofmt);
 896         if (ret < 0)
 897                 goto unlock;
 898
 899         if (subs->need_setup_ep) {
 900
 901                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 902                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 903                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 904                                                subs->cur_audiofmt->iface,
 905                                                alts,
 906                                                subs->cur_audiofmt,
 907                                                subs->cur_rate);
 908                 if (ret < 0)
 909                         goto unlock;
 910
 911                 ret = configure_endpoint(subs);
 912                 if (ret < 0)
 913                         goto unlock;
 914                 subs->need_setup_ep = false;
 915         }
 916
 917         /* some unit conversions in runtime */
 918         subs->data_endpoint->maxframesize =
 919                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 920         subs->data_endpoint->curframesize =
 921                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 922
 923         /* reset the pointer */
 924         subs->hwptr_done = 0;
 925         subs->transfer_done = 0;
 926         subs->last_delay = 0;
 927         subs->last_frame_number = 0;
 928         runtime->delay = 0;
 929
 930         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 931          * updates for all URBs would happen at the same time when starting */
 932         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 933                 ret = start_endpoints(subs);
 934
 935  unlock:
 936         snd_usb_unlock_shutdown(subs->stream->chip);
 937         return ret;
 938 }
 939
 940 static const struct snd_pcm_hardware snd_usb_hardware =
 941 {
 942         .info =                 SNDRV_PCM_INFO_MMAP |
 943                                 SNDRV_PCM_INFO_MMAP_VALID |
 944                                 SNDRV_PCM_INFO_BATCH |
 945                                 SNDRV_PCM_INFO_INTERLEAVED |
 946                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 947                                 SNDRV_PCM_INFO_PAUSE,
 948         .buffer_bytes_max =     1024 * 1024,
 949         .period_bytes_min =     64,
 950         .period_bytes_max =     512 * 1024,
 951         .periods_min =          2,
 952         .periods_max =          1024,
 953 };
 954
 955 static int hw_check_valid_format(struct snd_usb_substream *subs,
 956                                  struct snd_pcm_hw_params *params,
 957                                  struct audioformat *fp)
 958 {
 959         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 960         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 961         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 962         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 963         struct snd_mask check_fmts;
 964         unsigned int ptime;
 965
 966         /* check the format */
 967         snd_mask_none(&check_fmts);
 968         check_fmts.bits[0] = (u32)fp->formats;
 969         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 970         snd_mask_intersect(&check_fmts, fmts);
 971         if (snd_mask_empty(&check_fmts)) {
 972                 hwc_debug("   > check: no supported format %d\n", fp->format);
 973                 return 0;
 974         }
 975         /* check the channels */
 976         if (fp->channels < ct->min || fp->channels > ct->max) {
 977                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 978                 return 0;
 979         }
 980         /* check the rate is within the range */
 981         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 982                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 983                 return 0;
 984         }
 985         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 986                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 987                 return 0;
 988         }
 989         /* check whether the period time is >= the data packet interval */
 990         if (subs->speed != USB_SPEED_FULL) {
 991                 ptime = 125 * (1 << fp->datainterval);
 992                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 993                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 994                         return 0;
 995                 }
 996         }
 997         return 1;
 998 }
 999
1000 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1001                         struct snd_pcm_hw_rule *rule)
1002 {
1003         struct snd_usb_substream *subs = rule->private;
1004         struct audioformat *fp;
1005         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1006         unsigned int rmin, rmax;
1007         int changed;
1008
1009         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1010         changed = 0;
1011         rmin = rmax = 0;
1012         list_for_each_entry(fp, &subs->fmt_list, list) {
1013                 if (!hw_check_valid_format(subs, params, fp))
1014                         continue;
1015                 if (changed++) {
1016                         if (rmin > fp->rate_min)
1017                                 rmin = fp->rate_min;
1018                         if (rmax < fp->rate_max)
1019                                 rmax = fp->rate_max;
1020                 } else {
1021                         rmin = fp->rate_min;
1022                         rmax = fp->rate_max;
1023                 }
1024         }
1025
1026         if (!changed) {
1027                 hwc_debug("  --> get empty\n");
1028                 it->empty = 1;
1029                 return -EINVAL;
1030         }
1031
1032         changed = 0;
1033         if (it->min < rmin) {
1034                 it->min = rmin;
1035                 it->openmin = 0;
1036                 changed = 1;
1037         }
1038         if (it->max > rmax) {
1039                 it->max = rmax;
1040                 it->openmax = 0;
1041                 changed = 1;
1042         }
1043         if (snd_interval_checkempty(it)) {
1044                 it->empty = 1;
1045                 return -EINVAL;
1046         }
1047         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1048         return changed;
1049 }
1050
1051
1052 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1053                             struct snd_pcm_hw_rule *rule)
1054 {
1055         struct snd_usb_substream *subs = rule->private;
1056         struct audioformat *fp;
1057         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1058         unsigned int rmin, rmax;
1059         int changed;
1060
1061         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1062         changed = 0;
1063         rmin = rmax = 0;
1064         list_for_each_entry(fp, &subs->fmt_list, list) {
1065                 if (!hw_check_valid_format(subs, params, fp))
1066                         continue;
1067                 if (changed++) {
1068                         if (rmin > fp->channels)
1069                                 rmin = fp->channels;
1070                         if (rmax < fp->channels)
1071                                 rmax = fp->channels;
1072                 } else {
1073                         rmin = fp->channels;
1074                         rmax = fp->channels;
1075                 }
1076         }
1077
1078         if (!changed) {
1079                 hwc_debug("  --> get empty\n");
1080                 it->empty = 1;
1081                 return -EINVAL;
1082         }
1083
1084         changed = 0;
1085         if (it->min < rmin) {
1086                 it->min = rmin;
1087                 it->openmin = 0;
1088                 changed = 1;
1089         }
1090         if (it->max > rmax) {
1091                 it->max = rmax;
1092                 it->openmax = 0;
1093                 changed = 1;
1094         }
1095         if (snd_interval_checkempty(it)) {
1096                 it->empty = 1;
1097                 return -EINVAL;
1098         }
1099         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1100         return changed;
1101 }
1102
1103 static int hw_rule_format(struct snd_pcm_hw_params *params,
1104                           struct snd_pcm_hw_rule *rule)
1105 {
1106         struct snd_usb_substream *subs = rule->private;
1107         struct audioformat *fp;
1108         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1109         u64 fbits;
1110         u32 oldbits[2];
1111         int changed;
1112
1113         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1114         fbits = 0;
1115         list_for_each_entry(fp, &subs->fmt_list, list) {
1116                 if (!hw_check_valid_format(subs, params, fp))
1117                         continue;
1118                 fbits |= fp->formats;
1119         }
1120
1121         oldbits[0] = fmt->bits[0];
1122         oldbits[1] = fmt->bits[1];
1123         fmt->bits[0] &= (u32)fbits;
1124         fmt->bits[1] &= (u32)(fbits >> 32);
1125         if (!fmt->bits[0] && !fmt->bits[1]) {
1126                 hwc_debug("  --> get empty\n");
1127                 return -EINVAL;
1128         }
1129         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1130         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1131         return changed;
1132 }
1133
1134 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1135                                struct snd_pcm_hw_rule *rule)
1136 {
1137         struct snd_usb_substream *subs = rule->private;
1138         struct audioformat *fp;
1139         struct snd_interval *it;
1140         unsigned char min_datainterval;
1141         unsigned int pmin;
1142         int changed;
1143
1144         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1145         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1146         min_datainterval = 0xff;
1147         list_for_each_entry(fp, &subs->fmt_list, list) {
1148                 if (!hw_check_valid_format(subs, params, fp))
1149                         continue;
1150                 min_datainterval = min(min_datainterval, fp->datainterval);
1151         }
1152         if (min_datainterval == 0xff) {
1153                 hwc_debug("  --> get empty\n");
1154                 it->empty = 1;
1155                 return -EINVAL;
1156         }
1157         pmin = 125 * (1 << min_datainterval);
1158         changed = 0;
1159         if (it->min < pmin) {
1160                 it->min = pmin;
1161                 it->openmin = 0;
1162                 changed = 1;
1163         }
1164         if (snd_interval_checkempty(it)) {
1165                 it->empty = 1;
1166                 return -EINVAL;
1167         }
1168         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1169         return changed;
1170 }
1171
1172 /*
1173  *  If the device supports unusual bit rates, does the request meet these?
1174  */
1175 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1176                                   struct snd_usb_substream *subs)
1177 {
1178         struct audioformat *fp;
1179         int *rate_list;
1180         int count = 0, needs_knot = 0;
1181         int err;
1182
1183         kfree(subs->rate_list.list);
1184         subs->rate_list.list = NULL;
1185
1186         list_for_each_entry(fp, &subs->fmt_list, list) {
1187                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1188                         return 0;
1189                 count += fp->nr_rates;
1190                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1191                         needs_knot = 1;
1192         }
1193         if (!needs_knot)
1194                 return 0;
1195
1196         subs->rate_list.list = rate_list =
1197                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1198         if (!subs->rate_list.list)
1199                 return -ENOMEM;
1200         subs->rate_list.count = count;
1201         subs->rate_list.mask = 0;
1202         count = 0;
1203         list_for_each_entry(fp, &subs->fmt_list, list) {
1204                 int i;
1205                 for (i = 0; i < fp->nr_rates; i++)
1206                         rate_list[count++] = fp->rate_table[i];
1207         }
1208         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1209                                          &subs->rate_list);
1210         if (err < 0)
1211                 return err;
1212
1213         return 0;
1214 }
1215
1216
1217 /*
1218  * set up the runtime hardware information.
1219  */
1220
1221 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1222 {
1223         struct audioformat *fp;
1224         unsigned int pt, ptmin;
1225         int param_period_time_if_needed;
1226         int err;
1227
1228         runtime->hw.formats = subs->formats;
1229
1230         runtime->hw.rate_min = 0x7fffffff;
1231         runtime->hw.rate_max = 0;
1232         runtime->hw.channels_min = 256;
1233         runtime->hw.channels_max = 0;
1234         runtime->hw.rates = 0;
1235         ptmin = UINT_MAX;
1236         /* check min/max rates and channels */
1237         list_for_each_entry(fp, &subs->fmt_list, list) {
1238                 runtime->hw.rates |= fp->rates;
1239                 if (runtime->hw.rate_min > fp->rate_min)
1240                         runtime->hw.rate_min = fp->rate_min;
1241                 if (runtime->hw.rate_max < fp->rate_max)
1242                         runtime->hw.rate_max = fp->rate_max;
1243                 if (runtime->hw.channels_min > fp->channels)
1244                         runtime->hw.channels_min = fp->channels;
1245                 if (runtime->hw.channels_max < fp->channels)
1246                         runtime->hw.channels_max = fp->channels;
1247                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1248                         /* FIXME: there might be more than one audio formats... */
1249                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1250                                 fp->frame_size;
1251                 }
1252                 pt = 125 * (1 << fp->datainterval);
1253                 ptmin = min(ptmin, pt);
1254         }
1255
1256         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1257         if (subs->speed == USB_SPEED_FULL)
1258                 /* full speed devices have fixed data packet interval */
1259                 ptmin = 1000;
1260         if (ptmin == 1000)
1261                 /* if period time doesn't go below 1 ms, no rules needed */
1262                 param_period_time_if_needed = -1;
1263
1264         err = snd_pcm_hw_constraint_minmax(runtime,
1265                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1266                                            ptmin, UINT_MAX);
1267         if (err < 0)
1268                 return err;
1269
1270         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1271                                   hw_rule_rate, subs,
1272                                   SNDRV_PCM_HW_PARAM_FORMAT,
1273                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1274                                   param_period_time_if_needed,
1275                                   -1);
1276         if (err < 0)
1277                 return err;
1278         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1279                                   hw_rule_channels, subs,
1280                                   SNDRV_PCM_HW_PARAM_FORMAT,
1281                                   SNDRV_PCM_HW_PARAM_RATE,
1282                                   param_period_time_if_needed,
1283                                   -1);
1284         if (err < 0)
1285                 return err;
1286         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1287                                   hw_rule_format, subs,
1288                                   SNDRV_PCM_HW_PARAM_RATE,
1289                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1290                                   param_period_time_if_needed,
1291                                   -1);
1292         if (err < 0)
1293                 return err;
1294         if (param_period_time_if_needed >= 0) {
1295                 err = snd_pcm_hw_rule_add(runtime, 0,
1296                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1297                                           hw_rule_period_time, subs,
1298                                           SNDRV_PCM_HW_PARAM_FORMAT,
1299                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1300                                           SNDRV_PCM_HW_PARAM_RATE,
1301                                           -1);
1302                 if (err < 0)
1303                         return err;
1304         }
1305         err = snd_usb_pcm_check_knot(runtime, subs);
1306         if (err < 0)
1307                 return err;
1308
1309         return snd_usb_autoresume(subs->stream->chip);
1310 }
1311
1312 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1313 {
1314         int direction = substream->stream;
1315         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1316         struct snd_pcm_runtime *runtime = substream->runtime;
1317         struct snd_usb_substream *subs = &as->substream[direction];
1318         int ret;
1319
1320         subs->interface = -1;
1321         subs->altset_idx = 0;
1322         runtime->hw = snd_usb_hardware;
1323         runtime->private_data = subs;
1324         subs->pcm_substream = substream;
1325         /* runtime PM is also done there */
1326
1327         /* initialize DSD/DOP context */
1328         subs->dsd_dop.byte_idx = 0;
1329         subs->dsd_dop.channel = 0;
1330         subs->dsd_dop.marker = 1;
1331
1332         ret = setup_hw_info(runtime, subs);
1333         if (ret == 0) {
1334                 ret = snd_media_stream_init(subs, as->pcm, direction);
1335                 if (ret)
1336                         snd_usb_autosuspend(subs->stream->chip);
1337         }
1338         return ret;
1339 }
1340
1341 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1342 {
1343         int direction = substream->stream;
1344         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1345         struct snd_usb_substream *subs = &as->substream[direction];
1346         int ret;
1347
1348         stop_endpoints(subs, true);
1349         snd_media_stop_pipeline(subs);
1350
1351         if (!as->chip->keep_iface &&
1352             subs->interface >= 0 &&
1353             !snd_usb_lock_shutdown(subs->stream->chip)) {
1354                 usb_set_interface(subs->dev, subs->interface, 0);
1355                 subs->interface = -1;
1356                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1357                 snd_usb_unlock_shutdown(subs->stream->chip);
1358                 if (ret < 0)
1359                         return ret;
1360         }
1361
1362         subs->pcm_substream = NULL;
1363         snd_usb_autosuspend(subs->stream->chip);
1364
1365         return 0;
1366 }
1367
1368 /* Since a URB can handle only a single linear buffer, we must use double
1369  * buffering when the data to be transferred overflows the buffer boundary.
1370  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1371  * for all URBs.
1372  */
1373 static void retire_capture_urb(struct snd_usb_substream *subs,
1374                                struct urb *urb)
1375 {
1376         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1377         unsigned int stride, frames, bytes, oldptr;
1378         int i, period_elapsed = 0;
1379         unsigned long flags;
1380         unsigned char *cp;
1381         int current_frame_number;
1382
1383         /* read frame number here, update pointer in critical section */
1384         current_frame_number = usb_get_current_frame_number(subs->dev);
1385
1386         stride = runtime->frame_bits >> 3;
1387
1388         for (i = 0; i < urb->number_of_packets; i++) {
1389                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1390                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1391                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1392                                 i, urb->iso_frame_desc[i].status);
1393                         // continue;
1394                 }
1395                 bytes = urb->iso_frame_desc[i].actual_length;
1396                 frames = bytes / stride;
1397                 if (!subs->txfr_quirk)
1398                         bytes = frames * stride;
1399                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1400                         int oldbytes = bytes;
1401                         bytes = frames * stride;
1402                         dev_warn_ratelimited(&subs->dev->dev,
1403                                  "Corrected urb data len. %d->%d\n",
1404                                                         oldbytes, bytes);
1405                 }
1406                 /* update the current pointer */
1407                 spin_lock_irqsave(&subs->lock, flags);
1408                 oldptr = subs->hwptr_done;
1409                 subs->hwptr_done += bytes;
1410                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1411                         subs->hwptr_done -= runtime->buffer_size * stride;
1412                 frames = (bytes + (oldptr % stride)) / stride;
1413                 subs->transfer_done += frames;
1414                 if (subs->transfer_done >= runtime->period_size) {
1415                         subs->transfer_done -= runtime->period_size;
1416                         period_elapsed = 1;
1417                 }
1418                 /* capture delay is by construction limited to one URB,
1419                  * reset delays here
1420                  */
1421                 runtime->delay = subs->last_delay = 0;
1422
1423                 /* realign last_frame_number */
1424                 subs->last_frame_number = current_frame_number;
1425                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1426
1427                 spin_unlock_irqrestore(&subs->lock, flags);
1428                 /* copy a data chunk */
1429                 if (oldptr + bytes > runtime->buffer_size * stride) {
1430                         unsigned int bytes1 =
1431                                         runtime->buffer_size * stride - oldptr;
1432                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1433                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1434                 } else {
1435                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1436                 }
1437         }
1438
1439         if (period_elapsed)
1440                 snd_pcm_period_elapsed(subs->pcm_substream);
1441 }
1442
1443 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1444                                              struct urb *urb, unsigned int bytes)
1445 {
1446         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1447         unsigned int stride = runtime->frame_bits >> 3;
1448         unsigned int dst_idx = 0;
1449         unsigned int src_idx = subs->hwptr_done;
1450         unsigned int wrap = runtime->buffer_size * stride;
1451         u8 *dst = urb->transfer_buffer;
1452         u8 *src = runtime->dma_area;
1453         u8 marker[] = { 0x05, 0xfa };
1454
1455         /*
1456          * The DSP DOP format defines a way to transport DSD samples over
1457          * normal PCM data endpoints. It requires stuffing of marker bytes
1458          * (0x05 and 0xfa, alternating per sample frame), and then expects
1459          * 2 additional bytes of actual payload. The whole frame is stored
1460          * LSB.
1461          *
1462          * Hence, for a stereo transport, the buffer layout looks like this,
1463          * where L refers to left channel samples and R to right.
1464          *
1465          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1466          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1467          *   .....
1468          *
1469          */
1470
1471         while (bytes--) {
1472                 if (++subs->dsd_dop.byte_idx == 3) {
1473                         /* frame boundary? */
1474                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1475                         src_idx += 2;
1476                         subs->dsd_dop.byte_idx = 0;
1477
1478                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1479                                 /* alternate the marker */
1480                                 subs->dsd_dop.marker++;
1481                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1482                                 subs->dsd_dop.channel = 0;
1483                         }
1484                 } else {
1485                         /* stuff the DSD payload */
1486                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1487
1488                         if (subs->cur_audiofmt->dsd_bitrev)
1489                                 dst[dst_idx++] = bitrev8(src[idx]);
1490                         else
1491                                 dst[dst_idx++] = src[idx];
1492
1493                         subs->hwptr_done++;
1494                 }
1495         }
1496         if (subs->hwptr_done >= runtime->buffer_size * stride)
1497                 subs->hwptr_done -= runtime->buffer_size * stride;
1498 }
1499
1500 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1501                         int offset, int stride, unsigned int bytes)
1502 {
1503         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1504
1505         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1506                 /* err, the transferred area goes over buffer boundary. */
1507                 unsigned int bytes1 =
1508                         runtime->buffer_size * stride - subs->hwptr_done;
1509                 memcpy(urb->transfer_buffer + offset,
1510                        runtime->dma_area + subs->hwptr_done, bytes1);
1511                 memcpy(urb->transfer_buffer + offset + bytes1,
1512                        runtime->dma_area, bytes - bytes1);
1513         } else {
1514                 memcpy(urb->transfer_buffer + offset,
1515                        runtime->dma_area + subs->hwptr_done, bytes);
1516         }
1517         subs->hwptr_done += bytes;
1518         if (subs->hwptr_done >= runtime->buffer_size * stride)
1519                 subs->hwptr_done -= runtime->buffer_size * stride;
1520 }
1521
1522 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1523                                       struct urb *urb, int stride,
1524                                       unsigned int bytes)
1525 {
1526         __le32 packet_length;
1527         int i;
1528
1529         /* Put __le32 length descriptor at start of each packet. */
1530         for (i = 0; i < urb->number_of_packets; i++) {
1531                 unsigned int length = urb->iso_frame_desc[i].length;
1532                 unsigned int offset = urb->iso_frame_desc[i].offset;
1533
1534                 packet_length = cpu_to_le32(length);
1535                 offset += i * sizeof(packet_length);
1536                 urb->iso_frame_desc[i].offset = offset;
1537                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1538                 memcpy(urb->transfer_buffer + offset,
1539                        &packet_length, sizeof(packet_length));
1540                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1541                             stride, length);
1542         }
1543         /* Adjust transfer size accordingly. */
1544         bytes += urb->number_of_packets * sizeof(packet_length);
1545         return bytes;
1546 }
1547
1548 static void prepare_playback_urb(struct snd_usb_substream *subs,
1549                                  struct urb *urb)
1550 {
1551         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1552         struct snd_usb_endpoint *ep = subs->data_endpoint;
1553         struct snd_urb_ctx *ctx = urb->context;
1554         unsigned int counts, frames, bytes;
1555         int i, stride, period_elapsed = 0;
1556         unsigned long flags;
1557
1558         stride = runtime->frame_bits >> 3;
1559
1560         frames = 0;
1561         urb->number_of_packets = 0;
1562         spin_lock_irqsave(&subs->lock, flags);
1563         subs->frame_limit += ep->max_urb_frames;
1564         for (i = 0; i < ctx->packets; i++) {
1565                 if (ctx->packet_size[i])
1566                         counts = ctx->packet_size[i];
1567                 else
1568                         counts = snd_usb_endpoint_next_packet_size(ep);
1569
1570                 /* set up descriptor */
1571                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1572                 urb->iso_frame_desc[i].length = counts * ep->stride;
1573                 frames += counts;
1574                 urb->number_of_packets++;
1575                 subs->transfer_done += counts;
1576                 if (subs->transfer_done >= runtime->period_size) {
1577                         subs->transfer_done -= runtime->period_size;
1578                         subs->frame_limit = 0;
1579                         period_elapsed = 1;
1580                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1581                                 if (subs->transfer_done > 0) {
1582                                         /* FIXME: fill-max mode is not
1583                                          * supported yet */
1584                                         frames -= subs->transfer_done;
1585                                         counts -= subs->transfer_done;
1586                                         urb->iso_frame_desc[i].length =
1587                                                 counts * ep->stride;
1588                                         subs->transfer_done = 0;
1589                                 }
1590                                 i++;
1591                                 if (i < ctx->packets) {
1592                                         /* add a transfer delimiter */
1593                                         urb->iso_frame_desc[i].offset =
1594                                                 frames * ep->stride;
1595                                         urb->iso_frame_desc[i].length = 0;
1596                                         urb->number_of_packets++;
1597                                 }
1598                                 break;
1599                         }
1600                 }
1601                 /* finish at the period boundary or after enough frames */
1602                 if ((period_elapsed ||
1603                                 subs->transfer_done >= subs->frame_limit) &&
1604                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1605                         break;
1606         }
1607         bytes = frames * ep->stride;
1608
1609         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1610                      subs->cur_audiofmt->dsd_dop)) {
1611                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1612         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1613                            subs->cur_audiofmt->dsd_bitrev)) {
1614                 /* bit-reverse the bytes */
1615                 u8 *buf = urb->transfer_buffer;
1616                 for (i = 0; i < bytes; i++) {
1617                         int idx = (subs->hwptr_done + i)
1618                                 % (runtime->buffer_size * stride);
1619                         buf[i] = bitrev8(runtime->dma_area[idx]);
1620                 }
1621
1622                 subs->hwptr_done += bytes;
1623                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1624                         subs->hwptr_done -= runtime->buffer_size * stride;
1625         } else {
1626                 /* usual PCM */
1627                 if (!subs->tx_length_quirk)
1628                         copy_to_urb(subs, urb, 0, stride, bytes);
1629                 else
1630                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1631                         /* bytes is now amount of outgoing data */
1632         }
1633
1634         /* update delay with exact number of samples queued */
1635         runtime->delay = subs->last_delay;
1636         runtime->delay += frames;
1637         subs->last_delay = runtime->delay;
1638
1639         /* realign last_frame_number */
1640         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1641         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1642
1643         if (subs->trigger_tstamp_pending_update) {
1644                 /* this is the first actual URB submitted,
1645                  * update trigger timestamp to reflect actual start time
1646                  */
1647                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1648                 subs->trigger_tstamp_pending_update = false;
1649         }
1650
1651         spin_unlock_irqrestore(&subs->lock, flags);
1652         urb->transfer_buffer_length = bytes;
1653         if (period_elapsed)
1654                 snd_pcm_period_elapsed(subs->pcm_substream);
1655 }
1656
1657 /*
1658  * process after playback data complete
1659  * - decrease the delay count again
1660  */
1661 static void retire_playback_urb(struct snd_usb_substream *subs,
1662                                struct urb *urb)
1663 {
1664         unsigned long flags;
1665         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1666         struct snd_usb_endpoint *ep = subs->data_endpoint;
1667         int processed = urb->transfer_buffer_length / ep->stride;
1668         int est_delay;
1669
1670         /* ignore the delay accounting when procssed=0 is given, i.e.
1671          * silent payloads are procssed before handling the actual data
1672          */
1673         if (!processed)
1674                 return;
1675
1676         spin_lock_irqsave(&subs->lock, flags);
1677         if (!subs->last_delay)
1678                 goto out; /* short path */
1679
1680         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1681         /* update delay with exact number of samples played */
1682         if (processed > subs->last_delay)
1683                 subs->last_delay = 0;
1684         else
1685                 subs->last_delay -= processed;
1686         runtime->delay = subs->last_delay;
1687
1688         /*
1689          * Report when delay estimate is off by more than 2ms.
1690          * The error should be lower than 2ms since the estimate relies
1691          * on two reads of a counter updated every ms.
1692          */
1693         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1694                 dev_dbg_ratelimited(&subs->dev->dev,
1695                         "delay: estimated %d, actual %d\n",
1696                         est_delay, subs->last_delay);
1697
1698         if (!subs->running) {
1699                 /* update last_frame_number for delay counting here since
1700                  * prepare_playback_urb won't be called during pause
1701                  */
1702                 subs->last_frame_number =
1703                         usb_get_current_frame_number(subs->dev) & 0xff;
1704         }
1705
1706  out:
1707         spin_unlock_irqrestore(&subs->lock, flags);
1708 }
1709
1710 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1711                                               int cmd)
1712 {
1713         struct snd_usb_substream *subs = substream->runtime->private_data;
1714
1715         switch (cmd) {
1716         case SNDRV_PCM_TRIGGER_START:
1717                 subs->trigger_tstamp_pending_update = true;
1718                 /* fall through */
1719         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1720                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1721                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1722                 subs->running = 1;
1723                 return 0;
1724         case SNDRV_PCM_TRIGGER_STOP:
1725                 stop_endpoints(subs, false);
1726                 subs->running = 0;
1727                 return 0;
1728         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1729                 subs->data_endpoint->prepare_data_urb = NULL;
1730                 /* keep retire_data_urb for delay calculation */
1731                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1732                 subs->running = 0;
1733                 return 0;
1734         }
1735
1736         return -EINVAL;
1737 }
1738
1739 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1740                                              int cmd)
1741 {
1742         int err;
1743         struct snd_usb_substream *subs = substream->runtime->private_data;
1744
1745         switch (cmd) {
1746         case SNDRV_PCM_TRIGGER_START:
1747                 err = start_endpoints(subs);
1748                 if (err < 0)
1749                         return err;
1750
1751                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1752                 subs->running = 1;
1753                 return 0;
1754         case SNDRV_PCM_TRIGGER_STOP:
1755                 stop_endpoints(subs, false);
1756                 subs->running = 0;
1757                 return 0;
1758         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1759                 subs->data_endpoint->retire_data_urb = NULL;
1760                 subs->running = 0;
1761                 return 0;
1762         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1763                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1764                 subs->running = 1;
1765                 return 0;
1766         }
1767
1768         return -EINVAL;
1769 }
1770
1771 static const struct snd_pcm_ops snd_usb_playback_ops = {
1772         .open =         snd_usb_pcm_open,
1773         .close =        snd_usb_pcm_close,
1774         .ioctl =        snd_pcm_lib_ioctl,
1775         .hw_params =    snd_usb_hw_params,
1776         .hw_free =      snd_usb_hw_free,
1777         .prepare =      snd_usb_pcm_prepare,
1778         .trigger =      snd_usb_substream_playback_trigger,
1779         .pointer =      snd_usb_pcm_pointer,
1780         .page =         snd_pcm_lib_get_vmalloc_page,
1781 };
1782
1783 static const struct snd_pcm_ops snd_usb_capture_ops = {
1784         .open =         snd_usb_pcm_open,
1785         .close =        snd_usb_pcm_close,
1786         .ioctl =        snd_pcm_lib_ioctl,
1787         .hw_params =    snd_usb_hw_params,
1788         .hw_free =      snd_usb_hw_free,
1789         .prepare =      snd_usb_pcm_prepare,
1790         .trigger =      snd_usb_substream_capture_trigger,
1791         .pointer =      snd_usb_pcm_pointer,
1792         .page =         snd_pcm_lib_get_vmalloc_page,
1793 };
1794
1795 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1796         .open =         snd_usb_pcm_open,
1797         .close =        snd_usb_pcm_close,
1798         .ioctl =        snd_pcm_lib_ioctl,
1799         .hw_params =    snd_usb_hw_params,
1800         .hw_free =      snd_usb_hw_free,
1801         .prepare =      snd_usb_pcm_prepare,
1802         .trigger =      snd_usb_substream_playback_trigger,
1803         .pointer =      snd_usb_pcm_pointer,
1804         .page =         snd_pcm_sgbuf_ops_page,
1805 };
1806
1807 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1808         .open =         snd_usb_pcm_open,
1809         .close =        snd_usb_pcm_close,
1810         .ioctl =        snd_pcm_lib_ioctl,
1811         .hw_params =    snd_usb_hw_params,
1812         .hw_free =      snd_usb_hw_free,
1813         .prepare =      snd_usb_pcm_prepare,
1814         .trigger =      snd_usb_substream_capture_trigger,
1815         .pointer =      snd_usb_pcm_pointer,
1816         .page =         snd_pcm_sgbuf_ops_page,
1817 };
1818
1819 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1820 {
1821         const struct snd_pcm_ops *ops;
1822
1823         if (snd_usb_use_vmalloc)
1824                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1825                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1826         else
1827                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1828                         &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1829         snd_pcm_set_ops(pcm, stream, ops);
1830 }
1831
1832 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1833 {
1834         struct snd_pcm *pcm = subs->stream->pcm;
1835         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1836         struct device *dev = subs->dev->bus->controller;
1837
1838         if (!snd_usb_use_vmalloc)
1839                 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1840                                               dev, 64*1024, 512*1024);
1841 }